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dati-semantic-mcp: Instructions file for Claude Code

CLAUDE.md

dati-semantic-mcp CLAUDE.md is an instructions file for Claude Code from italia/dati-semantic-mcp. It costs 1,355 tokens per session, scanned A, original, MIT.

Project instructions for an MCP server that lets AI agents explore Italy's public-administration catalog of data models and vocabularies. It uses SPARQL, a query language for connected data, to search the catalog.

In plain words
What is it for?
Use them when building or changing the TypeScript server, querying the catalog, exploring ontologies and classes, or loading and analyzing local RDF data.
Why use it?
They explain how to build and run the server and what its tools are meant to inspect. This helps an agent work with the catalog without guessing its structure or commands.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is italia/dati-semantic-mcp's own configuration. It tells Claude Code how to work on dati-semantic-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything dati-semantic-mcp configures →

not rated 9repo 4mo ago A scan 1,355 tokens original MIT
View source ↗ italia/dati-semantic-mcp italia.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to italia/dati-semantic-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/italia/dati-semantic-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/italia/dati-semantic-mcp

Made for: Claude Code.

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<a href="https://agentmods.dev/instructions/italia/dati-semantic-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/italia/dati-semantic-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,355 This file is loaded in full into every session.
When invoked 1,355 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.01355 $0.01355
Opus 5 $0.00678 $0.00678
Sonnet 5 $0.00271 $0.00271
Haiku 4.5 $0.00136 $0.00136

Measured 9d ago against content hash 14ba09d79b7c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

dati-semantic-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 119 lines

How it starts

The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

This is an MCP (Model Context Protocol) server that provides semantic interaction with the schema.gov.it SPARQL endpoint. It enables AI agents to explore and analyze Italy's semantic web catalog of public administration ontologies.

Build Commands

npm run build    # Compile TypeScript from src/ to dist/
npm start        # Run the compiled server (node dist/index.js)

No test or lint commands are configured. The project uses TypeScript strict mode for type checking.

Architecture

Server Structure

Single-file implementation (src/index.ts) using:

  • @modelcontextprotocol/sdk for MCP protocol handling over stdio
  • zod for parameter validation
  • Direct fetch calls to the SPARQL endpoint
  • oxigraph (WASM) for local RDF file loading and SPARQL execution

Tool Hierarchy (33 tools)

Base Operations:

  • query_sparql - Raw SPARQL execution with automatic prefix injection
  • explore_catalog - List available graphs/ontologies
  • explore_classes - Discover classes with instance counts

Semantic Analytics:

  • check_coverage - Analyze usage of specific classes/properties
  • check_quality - Find missing labels/descriptions
  • check_overlaps - Identify duplicate labels or explicit mappings

Data Model (Ontologies):

  • list_ontologies - List available ontologies with titles
  • explore_ontology - List classes and properties in a specific ontology
  • list_properties - List ObjectProperty and DatatypeProperty with domain/range
  • get_property_details - Full property details (domain, range, inverse, functional)

Controlled Vocabularies:

  • list_vocabularies - List ConceptSchemes with instance counts
  • search_in_vocabulary - Search concepts within a specific vocabulary
  • browse_vocabulary - Paginated browsing of large vocabularies

Catalogs & Datasets:

  • list_datasets - List DCAT-AP_IT datasets
  • explore_dataset - Get dataset details and distributions
  • preview_distribution - Download and preview first rows of CSV/JSON data

Read the full file on GitHub · 119 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 119 lines · 1,355 tokens per session scan A 14ba09d79b7c

Subscribe to this mod's changes

dati-semantic-mcp CLAUDE.md is an instructions file published in the GitHub repository italia/dati-semantic-mcp (9 stars, last pushed 4mo ago), licensed MIT. It adds 1,355 tokens to every session, about $0.0068 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

aimcp-serverontologiessemantics
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